Hello,
I have searched for a good part of the day, but cannot seem to find an answer to this. I hope this is an appropriate forum for my question.
I am wanting to download a blog web page using a script. It requires username and password login. I have tried the following (an example) to no... (1 Reply)
Hi,
I am using curl to hit a url using http in solaris 10 using commandline, I want to transfer an attachment(using multipart curl -F) also as a part of the request. If anyone has used kindly help me with the syntax. I am using below command:
Code:
/usr/local/bin/curl -v... (1 Reply)
Hello all.
I have an incredible number of servers that I need to change a parameter on using a web interface. I'd like to be able to do this via curl, but I'm having some trouble. I filled out the form and hit update while snooping (tcpdump) my interface. That gave the the following as what is... (0 Replies)
I am trying to write a shell script to use curl in order to automate downloading data from a website. The URL with the post form is here: http://try-db.org/de/InfoBySpecies.php .
I have a list of about 1800 different species I want to check. For Example, choose the first species and use the... (2 Replies)
Hi All,
I am trying to post an xml file (utf-16 encoded) using curl to a REST service. The REST service is expecting 'multipart/form-data' content type.
curl -k -i -H "Content-Type=multipart/form-data" -F "filename=@file.xml;type=text/xml" -X POST -u <username>:<password> <endPointURL>
... (0 Replies)
how to make the bash script ?
http://server.com/mysql.php
POST /mysql.php HTTP/1.1
Host: server.com
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:26.0) Gecko/20100101 Firefox/26.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language:... (1 Reply)
I am trying post SOAP header from file to curl command.
The curl command is
curl -vk -H "$(cat curl-test1.txt)" -X POST https://xvcfvusdgfsd.sdfjd.gf/cmsws/CMSService
The contet of curl file is
POST: https://cmsuat.chrysler.com/cmsusws/CMSService HTTP/1.1
SOAPAction:... (1 Reply)
Hello,
I'm new in the forum and really beginer, and also sorry form my bad english.
I use linux and want to create little program to download automaticaly some pdf (invoices) and put in a folder of my computer. I learn how to do and programme with ubuntu but the program will be implemented... (1 Reply)
i'm using this command to post data to a remote host:
wget --post-data="My Data" http://<my-ip>:80 -O /dev/null -q
and
curl --data "My Data" http://<my-ip>:80
however, when i run the above, i see the following in my access log on the remote host:
Wget:
10.10.10.10 - - "POST /... (1 Reply)
Hi,
I write a new thread to discuss about my closed topic with new information ( /280990-curl-post-form-issue.html )
The previous post was closed because of missing informations, I didn't have access yet to server logs.
----------------------------------------------------------------------... (4 Replies)
Discussion started by: Fred13
4 Replies
LEARN ABOUT DEBIAN
perlbal::manual::loadbalancer
Perlbal::Manual::LoadBalancer(3pm) User Contributed Perl Documentation Perlbal::Manual::LoadBalancer(3pm)NAME
Perlbal::Manual::LoadBalancer - Using Perlbal as a Load Balancer
VERSION
Perlbal 1.78.
DESCRIPTION
How to configure a Perlbal Load Balancing service.
READ ME FIRST
Please read Perlbal::Manual::Configuration first for a better explanation on how to configure Perlbal. This document will make much more
sense after reading that.
Using Perlbal as a Load Balancer
For a better understanding of how to set up Perbal as a Load Balancer, it should be noted that a Load Balancer and a Reverse Proxy can
often be the same thing; not always, but often.
A Load Balancer is a server (or device) that balances requests across a number of servers to spread the load. A Reverse Proxy can still do
this but also have a number of other features.
Perlbal as a Reverse Proxy provides features such as buffering content, preserving connections to the backend servers, starting connections
ahead of time and a high priority queue, among others.
You could almost say that a Load Balancer is a subset of a Reverse Proxy (it's not, but you could).
When it comes to Perlbal, the Load Balancer is implemented as a Reverse Proxy without all the extra options, and that's why you set the
role of a Load Balancer to "reverse_proxy":
SET role = reverse_proxy
Simple load balancing
Let's assume you want to configure two machines to serve your website and you want to let Perlbal decide how to balance the requests. For
the sake of this exercise let's assume you have two servers at:
10.0.0.1:80
10.0.0.2:80
And now you want to use these two machines to serve your website at:
10.0.0.3:80
Here's a sample configuration to make this happen:
CREATE POOL mywebsite
POOL mywebsite ADD 10.0.0.1:80
POOL mywebsite ADD 10.0.0.2:80
CREATE SERVICE service_mywebsite
SET role = reverse_proxy
SET pool = mywebsite
SET listen = 10.0.0.3:80
ENABLE service_mywebsite
The first line defines a pool of machines called "mywebsite". The second and third lines add your two machines to that pool (note that the
indentation is not mandatory).
After that you define a service called "service_mywebsite" with the role "reverse_proxy" set to listen on "10.0.0.3:80" and using the pool
"mywebsite" to serve the requests.
The last line is what allows you have several services configured in a file even if they are not currently active (a common scenario is to
configure everything on the file and then enable/disable services on-the-fly as required; see Perlbal::Manual::Management for more
information on this process).
The Load Balancing algorithm
Perlbal uses a highly efficient load balancing algorithm. It is very effective for distributing dynamic web requests among potentially
heterogeneous hardware.
First, backend servers must have their MaxClients (for apache, or equivalent) setting tuned to a reasonable limit. If your hardware can run
20 requests in parallel before running out of CPU, set MaxClients to 20.
Next, by default Perlbal will distribute requests randomly. Opening a new connection to any available backend, and issuing the request.
The proper algorithm is able to be used if "verify_backend", "backend_persist", "backend_persist_cache", and "connect_ahead" are enabled.
SET persist_backend = on
SET verify_backend = on
SET backend_persist_cache = 5
SET connect_ahead = 2
In this configuration, Perlbal will only route client requests to backends that it knows are real processes, instead of the OS listen
queue. It will attempt to reuse pre-verified backends, and will attempt to create slightly more idle connections than it needs in
preparation of future requests.
When you put all this together, it becomes less likely that a client will wait for Perlbal to find an available backend. By setting your
MaxClients properly, backends are able to serve traffic without getting overwhelmed. If no backends are available, Perlbal will queue them
internally, rather than overload backends.
You would want to disable "verify_backend" if you are balancing across image servers, or other extremely lightweight requests.
SEE ALSO
Perlbal::Manual::Configuration, Perlbal::Manual::FailOver, Perlbal::Manual::Management, Perlbal::Manual::ReverseProxy.
perl v5.14.2 2011-01-23 Perlbal::Manual::LoadBalancer(3pm)